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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3dc17fffa13a65e18e9ca9b797a1a9429a6a51a5b93134fd4d7424eff230fc7' 
  AND token = 'ExWYB2/QSQfnuq5kGP4Fmv4ocftqNzia9dnDgIXl8WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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