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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98dccd8566a46890105d024003994bddc9e682c76939b072980691d5fe810c2' 
  AND token = 'XA1dlou0m2PK2YnEztqc+wFGCNs/Y1aK3buntY0lv7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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