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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a472a72f62d400d989d4808876581e3a446966db83d5dd84c482b8ecb6b03c' 
  AND token = 'zDhPf1+I+Bj+6O3KWdP1RdgAF0KQNHKR5mUgoiZUNV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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