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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dade25b739c6ca1b0e909c8a9ca2b30b2022ead74b4d7c631a144f15a9608c9c' 
  AND token = '7v+4GG5pkojZY5/ImcBACTypRMDlt+97kl0GaVeXMhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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