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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a014aea0f79463ca3a2bd0283541c1fb5569df6c9358710963fd585f1e67f6c' 
  AND token = 'FuBybCE/IvG7/AfUSNRFYCWlWR/aTN7/py1j2VBR/JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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