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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5abbdedf7fcd1d1fb1111e3f7131fb83d356e2ff02fe0191615c1c30a000f9f7' 
  AND token = 'ZuoydEgUp7WkxX5SymVSijh+wY1TUiyX6EQamW1voKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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