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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c053eac373eede4a81da9264c6b1b2e3eafadec4d868ace09e2fe0fe89936d' 
  AND token = 'Vc1x6i7TOfIqbeodSGGNIBzzpR5PPYZXZhw7hwidbEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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