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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f20eccf38e81cfa2ff9864a804d6f5a54a3a65c144ea782dfab30d4b6aaa15' 
  AND token = 'rO2AfwSy8L+3RLVQLEF5yRMKZgBlKTe6UrEnbkR4Yx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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