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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59ea4b3b2f33e9ae0f4e095cd55a0a9deb847004901d3a830fbf3c38428cedd5' 
  AND token = 'iuhCqap6Mf/YRfniwObDDTUB1OmTsywAS58I3haaf/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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