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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f26f32bd864e90eb3cd479a7d95a18abce7a8cad7344470c1adc0098d24a9b' 
  AND token = 'L2VT1vCF4jc7D+8DCbIoDLJZXi1LhQ9XTa440cJbytE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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