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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e21348b5ccefb94c482a76dc2b60ec605abe45b03accdd1caceadb8d92aa78b3' 
  AND token = '7JYv79qrmQSzBiH7imcf1JVosBjl//a0VEB08Cg2Hr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}