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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24520150bd7b1a2cf59b45911d672fa7fec775fd9f965447dde265b06f6cbe25' 
  AND token = 'qkhIs5kBUuAizAU55S7y161RaOY6NSF47tH3maiU7u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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