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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6ed3a6563dd6364747904f105abf437b34a1199947b9bd5fef79a7909e98c0a' 
  AND token = 'xLB4sjhPct1TN/P0Dx+OZoybmnkVYlY0SfRb+x86VoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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