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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67fc3e279020fa0bd3e4b54810f5c3ed33389eae68716c56338aa6af7ebb7c2' 
  AND token = 'p/f2z6mzX2ved5CFiNpjWxOpmwD940tqBWkyM0C/eEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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