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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a30396efc361c8d8ce6474f986672f814feb748af60ce88505b1c96b4acfa4' 
  AND token = 'EuzA7madswV24+2L7IxxjmG0tVIk0O+3XXP4g2O8PCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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