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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0b78c32a48dbcf3c50732e724d51da281356c94e0543536c65d11289db91fc4' 
  AND token = 'I6u32cez/fmVCPA98/KzRYrZ0aIftTLGEYiNCOAnfsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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