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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4243d964126260a8bde4f2e204664723c3c264c4a0f70b6e92c2259e7bed07f4' 
  AND token = '8k7BABrW65RH6M02MtfVupa5oVgS2Xt8kt7dteEn0PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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