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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0b5474aa68e27c6074da5875a8e65153e4b71400a7a0e54ac4411b8172ef23c' 
  AND token = 'QOjvUC/bVSp46DpDzrH+oIXjwdSwQbVvGF6puElgAb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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