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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c419380c081a77d66c8afe9cc3f6618165d938d05dc843f166be65908b86d3a0' 
  AND token = 'T4gAURmLhHJ/0kKbukqVgF11D6sf7gs4KTO9PK7RfbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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