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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9898ce3f7611b96077d92a7c9f85fa7d9af78413b1bb0699f5c56dec9ca13362' 
  AND token = 'tA4JNfC+GK1x/+Y9/y2Dr+K91di/InK6Dlfd68Pg8FY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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