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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f509561301eff3e3469264ac940fd82fdd359ac06d0b3d2eaeae7120f5fe566' 
  AND token = 'i8FarUjHIgFInvE4hZ3ytiumsx6rkpKyaRluxEuUic8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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