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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b776765f9bd47c93243a2c32d97ac2ad64e82001d2dd0f3eeaec0d9f3806ab44' 
  AND token = 'SudnjJ1RIX1F5KpAqRQsuJJGjH6msKC+54Pg7bxoFQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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