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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2478b7191b0ebb20235031870c74bf3d27b16e88ac00bf2f3c9cfda74b9ec78b' 
  AND token = 'Svh7yBiClfvbNBErGbkAFUWSVO0fBGAOPTwiyfKUjD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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