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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b63008c22fb4fb3b91dc61600dfa759dd617683a481759008c4044452d0a3a1a' 
  AND token = 'gY8X3K44DrJMu1c12bgwlWA235kFtepU74wgmFudoA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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