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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa002985f3d74a437904a4ace1a84042f2653fd783d389bcd6edd6a251cd8fd' 
  AND token = 'etudmQl35Ioi34ye+Tvaw1/fys3Y0l9AfkhCTbNoXJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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