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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d19075f290e8c61448adefd238593849c55dd36fdcc01235101f6bdab10da6' 
  AND token = 'U8CN705oW3FGoxb+2NeShto4ql1TXTzfDqA0Gp/MfoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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