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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aafb3acd44aeea50aa9cfb18b7947c8127715321d1c0e284d07069189cb997b' 
  AND token = 'mQ1CvegZsI8049uF89/CjuszsFAGhHlAxbkIQ2lhyyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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