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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9a3df1c810c6bd3d71c57aff1ba205eb12043a8cce465c1777f3808aef7041' 
  AND token = '4ZpkzYFp+Mn9bi1LFtdw8dipv0UGLmkTYl1TaTuhX08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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