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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16e6f1bd6bcde99504fe2568c4a4d689d1185adbeeb5c6705918a97c2d2a242c' 
  AND token = 'FHb14htJuih1fq5Kgq/IuX86Q5f9MEVFa5Lb49WieL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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