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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a843905d95f88a4c06582a5e1d82727cce3030bd62018a6024a1231dac185f01' 
  AND token = 'Ljgzkw5kvvF8tIQxtNX4Hy6G6k0qOutG9REGnPekFfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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