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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9629c48affe227dd1cf0f56d83ca2720f1d90757d3334e7cbb5c5025cad17416' 
  AND token = '3nq2al/kR0Gfx+cfCG1YqEiSJMpPWgDBwZVM1d2dmwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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