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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67a458bb5b4c6427a5b0ce7f8b2dce3aee8168d0feb7cda0daa10c1f2fccced9' 
  AND token = '0KqdJ1Se7nLZNXmWOBK1CUlA2DCMbPAtUIvSZ43xJ0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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