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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5af328b980666aed587d0a21372ae80a0876bb40242de99d9089584f3260701a' 
  AND token = 'pLh363fV3LIE3mKNGB9ja68KbBVUzH0nCmbFuC5rL4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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