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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '930a16bd62ec131331ac80c53e53da23a1e02d06428b8950e87bf60e63f73847' 
  AND token = 'e1c6C1G/cZWmTjY24mK5UTGtP8l14IuQOx3Szmm/whM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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