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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f47c923e808d560c2d87f2b2e0d0a11ce12de77a940e2a3d583d1d2b6a0144' 
  AND token = 'iLfo3Qv2cXPXyLiKe3csxdQ3LExApWR0gy/Bf4+55ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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