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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a2ba07cf80cf6699dcc481a018bd54880aa731f6e8399980bb9b831ed89dde' 
  AND token = '7YwdPK66PELimYAa4wBoeEir3LI87odbZqWoG1Hwpok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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