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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '094922f3d721930a4b126d0f357ff48588bf3ef3fa51768ed30d29d2ce5cf8ad' 
  AND token = 'MkWlPLl0Q8X4HwyYI4k7fIEXjtO0YSfrzIa91NQJkqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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