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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e92fabc8065b83442b647e1bc0e05ddc83e76ec3fe79ff59a997778d23ac83' 
  AND token = 'kSdBVTy0i/w9aqZZrWKI80lslXpc+3zsr/Y5S0seXv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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