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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0902f74063e298bf774cc55df3fd1653b64e31e159ea98302bc46abd0c3defa' 
  AND token = 'XTc+qH6eM59vDbm5H56oclIubAAjz/0c3T0jM8agQFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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