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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eabe6a14a1a02e0d835305666f72809f57931107f817acc8ed73c7bcb819dc97' 
  AND token = 'y0+246RDCt9bQPBMRlu8mX2SZG45Wo9qv9ymzftKXIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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