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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b052ddff1a630a2e72d3225fa3621e0e8a1d42d495ea6b05dd2d790bcabe2a76' 
  AND token = 'OxG5WFyYHxfUaCEXu8a5JrARav1s0usqqK94m2oxYYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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