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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0bc57550274e3b0c960a2aeb88d10c88f82ff0c11aee37f48065549be87e8e6' 
  AND token = 'fXBRLn4ZbSDxfSAZVAk0XM4Vll1oS4kRCKnN1cs+Y50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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