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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fcf89c2a0fe9b7aff42633e0194934ded5b0deef403e98243b2376ccb0b62d8' 
  AND token = 'hCnTBK1sKf9rc1vIKS0K/q5uEpph97x1jiQ81cvijdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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