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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68967e58cd74e68d2384af0e0ada7c5ba71e46d0095a141a787282f040f6aa4b' 
  AND token = '6l5N+1HkfrT/qPA7KcaeLq8Up5rfI1SgvQqZ1EDDN/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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