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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df757398b37ee67e90572d5b5fe07a04deb26c5d78369ede6538214f0cc99d60' 
  AND token = 'iBfdIMoP/ILaqlLAyCnv+tBveCgnZppzAYLocAmWhuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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