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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b66f31728ced0c6680ea6ee3ec2e784cc49e1535c71763dba7c091749b1acd32' 
  AND token = 'Qe8QzrkPQDjse07bv/tNptYGCiG2NMRQ9WTH46dmjf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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