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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06dc6411e7d12e8fb514d7e5ce33f400b110cc93e4b4e5fc8ebcd200d30a2b68' 
  AND token = '8mmm7Wi2CYLPlBJpkesTVP0xlL5rDGSuR7iGllvpMBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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