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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e15bdfaad8c3053b77502541490eaa1f707926e3a999386dfb1d8c120b71c0f' 
  AND token = '02YqaOg23LnT9NIuYt8X497B3WXZ2peQ4LaeyR/AO3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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