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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0337eb04fd2deed8ff7593a02152aba2b02ce9697a0fdd37d942f9a2d74f0b' 
  AND token = 'ny9zQhbquBum1JXpKlVkaIn31Z3QFJGuDLMIALcemBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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