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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79067b6a1eff434ccdaa62f0b7855d70c2ef4aa94700ffdfd3089d1cfa346664' 
  AND token = 'TQCCvpbqZE/dnLWu74Mm/F5NliFKEdCqSU/Ab8W0QF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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