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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae1922022b7d200ed369a2d10c5dfa16a5f9fc12b3988024b500eb32c05e469' 
  AND token = 'ygLB82BPV3cgrvsP9zoIiV393KhVddrrw/r/V08Kft0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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