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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767a3ba79c338c16f56e5abaae4f6313f56d092504102067aa867af410e6261b' 
  AND token = 'o2+i+iPEbD94VFUTyq497gR0QS2Mrnx86gITIh9h/rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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