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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f4caf54e06f7349504ca3872f05733df8960654679741c9cfc9de03fac11474' 
  AND token = 'Fy6Bxyd9U6++TAut5MH7X1CI0KJzzQeUs2Kgg6ykZnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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