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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cec89a0402e56fe365fad3462f49ea49c9983eca06759c9ca3da92ec53bf26b' 
  AND token = 'ePA6J/czagX90EVux9ufPMcF2mMYXPi30zD57y/qlAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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