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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb9a6e501d320ce12e54b886714ae42899c73d4c059af4f45fd3ee41f97138e' 
  AND token = 'owv/dG54PHAeIcwq2YD0Wil7JoEvBaRM++MRJzf+/KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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