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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ffb04fed8dc39962b6d0041faff094fcb506d38ce96402334d5bf4eac9ec55' 
  AND token = 'hABFLr/A84/92iXJnjAhA0zu8hTtX5tmyYhAzpyeoGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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