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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce4c150c376e3334473fecbf59e2a4b417211623fe4a7f2e2203155659a646e' 
  AND token = 'ijeYsyhSzOU7+yzVHussCjmsc07mKwPFZ6MgSBFwqgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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