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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66526dfba354f9bcbd0559ab27f360bd7d64a4694ea4903fe2352c92a8bb9009' 
  AND token = 'ktfhlAzEl6e2rxMcfTu1D88lFb2iySjb7vVloxQHCU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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